Boyle's Law Glass Tubes, Open and Closed, 2-Piece Entomology & Zoology_Zoology Charts & Models supplying two voltmeter scales on

supplying two voltmeter scales on one accessory so students switch between low and mid-cell voltages without rewiring

and redistribution during cell division for biology instruction

Demonstration-scale electrolyzer sized for whole-class viewing

and chemistry procedures

Element-stamped 20mm solid brass cube for density investigation

Boyle's Law Glass Tubes, Open and Closed, 2-Piece Entomology & Zoology_Zoology Charts & Models supplying two voltmeter scales onTwo piece Boyle's Law glass tube set with one open and one closed tube, sized for demonstrating the inverse pressure volume relationship of a gas at constant temperature.